Malicious PDF — malware analysis report

Static analysis result for SHA-256 4823394305d4517b…

MALICIOUS

PDF

84.0 KB Created: 2021-05-07 12:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: caafddfc5bd0eb6116aa7f455c4fc482 SHA-1: f6e9c4e7cfd0059ebc7a0460effb79c1605f1c85 SHA-256: 4823394305d4517b11093557c03d060af3d473ba0a4a30175e4f711efa0579e7
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external URIs, with a primary suspicious URL being https://botokaw.ru/strik. The presence of multiple external links suggests an attempt to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/strik?utm_term=big+b+bigadda PDF link annotation
    • http://frasqen.online/oraciones_para_encender_las_velas_dela_corona_de_adviento_en_familia3nb7t.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/1212067.pdfIn PDF document text
    • http://igoscandinavia.com/2229063955kps8j.pdfIn PDF document text
    • https://sovewepipofev.weebly.com/uploads/1/3/4/8/134846449/sabifiwame.pdfIn PDF document text
    • http://kleomaften.online/rinnai_heater_error_code_listt1v6v.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/3268363.pdfIn PDF document text
    • https://safasisi.weebly.com/uploads/1/3/4/4/134472516/c39d23949afa413.pdfIn PDF document text
    • http://biolinkus.me/how_to_animate_procreate_pocket7d9hl.pdfIn PDF document text
    • https://gazonigupeti.weebly.com/uploads/1/3/4/8/134879892/9213f.pdfIn PDF document text
    • http://topsalon.xyz/ballade_pour_adeline_violin_sheet_music_freew2450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_3aa5bcd50b3f40b0893d2d0b342973c5.pdf?index=trueIn PDF document text
    • http://vujijemu.atwebpages.com/algebra_2_common_core_textbook.pdfIn PDF document text
    • http://jujobope.atwebpages.com/4082039524.pdfIn PDF document text
    • https://eaae50f7-3b1c-4f1b-9b3c-e2a48377569d.filesusr.com/ugd/b96e41_2c19e8800a074f4cb26971dcac1503e0.pdf?index=trueIn PDF document text
    • https://eff7b67d-fef5-45b7-bcd6-ffb1b71d3a14.filesusr.com/ugd/b4c9df_9303f0de6d06457fa6be079518ac5810.pdf?index=trueIn PDF document text
    • http://tazafira.epizy.com/gusabafevutewajutewu.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_9aff33fc0a814f5ba5346b76906f342e.pdf?index=trueIn PDF document text
    • http://vepitejususas.atwebpages.com/binoxogoja.pdfIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_b61ef5f7c4c2456f908b06dacc19470b.pdf?index=trueIn PDF document text
    • https://f459ab6e-ac57-43ce-b83a-1524846427e4.filesusr.com/ugd/938c70_c629f738d1db450ba5c02c71196256fd.pdf?index=trueIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_ba26180e297f4feeaddad8a5d3bf5477.pdf?index=trueIn PDF document text
    • http://nejegidijikoj.epizy.com/55146163403.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 4252 bytes
SHA-256: eeae397971be10ae345af141c67ca7f748cadffa2f3a2a46d5d3ce574bc4d43b
font_01_sfnt_off00010c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8E 11744 bytes
SHA-256: cce778b1ca04693e6ead242bc43cb439e318036df5e67ea525c41a5c78dbe932
font_02_sfnt_off0001347e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1347E 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c